This book identifies the different kinds of essentials and how God's unerring Word and correct hermeneutics foundationally supports these essentials. It explores how the church historically has affirmed and preserved the inspiration and inerrancy of the Bible. Moving to the modern period, we explore the battles over inerrancy involving the Evangelical Theological Society as well as cases involving evangelical scholars that have seemingly affirmed inerrancy, but have clearly slid away from inerrancy as indicated by their works. Finally, we map a course as to how orthodoxy can be lost and best preserved.